Scan help please

Laura • I`m laura 24 , mummy to 3 angels and now hopefully expecting my rainbow baby... ❤️
So today I had a scan. According to my LMP I should be nearly 7 weeks. Well I went for a scan today and all they could see was the gestational sac and the yolk sac but no baby. They are telling me that in more like 5 weeks but I track my ovulation and I'm sure that I'm nearly 7 any help